js根据日期判断星座的代码

function xingzuo() {
var start = 1901, date=document.getElementById("txtDay").value, month=document.getElementById("txtMonth").value;;
with (document.getElementById("txtXZ")){
//根据日历显示星座
if (month == 1 && date >=20 || month == 2 && date <=18) {value = "水瓶座";}
if (month == 1 && date > 31) {value = "Huh?";}
if (month == 2 && date >=19 || month == 3 && date <=20) {value = "双鱼座";}
if (month == 2 && date > 29) {value = "Say what?";}
if (month == 3 && date >=21 || month == 4 && date <=19) {value = "白羊座";}
if (month == 3 && date > 31) {value = "OK. Whatever.";}
if (month == 4 && date >=20 || month == 5 && date <=20) {value = "金牛座";}
if (month == 4 && date > 30) {value = "I'm soooo sorry!";}
if (month == 5 && date >=21 || month == 6 && date <=21) {value = "双子座";}
if (month == 5 && date > 31) {value = "Umm ... no.";}
if (month == 6 && date >=22 || month == 7 && date <=22) {value = "巨蟹座";}
if (month == 6 && date > 30) {value = "Sorry.";}
if (month == 7 && date >=23 || month == 8 && date <=22) {value = "狮子座";}
if (month == 7 && date > 31) {value = "Excuse me?";}
if (month == 8 && date >=23 || month == 9 && date <=22) {value = "室女座";}
if (month == 8 && date > 31) {value = "Yeah. Right.";}
if (month == 9 && date >=23 || month == 10 && date <=22) {value = "天秤座";}
if (month == 9 && date > 30) {value = "Try Again.";}
if (month == 10 && date >=23 || month == 11 && date <=21) {value = "天蝎座";}
if (month == 10 && date > 31) {value = "Forget it!";}
if (month == 11 && date >=22 || month == 12 && date <=21) {value = "人马座";}
if (month == 11 && date > 30) {value = "Invalid Date";}
if (month == 12 && date >=22 || month == 1 && date <=19) {value = "摩羯座";}
if (month == 12 && date > 31) {value = "No way!";}
}
}